SHA-3/256 generator

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Processed instantly and never stored — we keep no copy of your input.

What Is SHA3-256?

SHA3-256 is the 256-bit flagship of the SHA-3 (Keccak) family — the same sponge construction as SHA3-224/384/512, parameterized for a 256-bit output (64 hex characters). It is to SHA-2 what a submarine is to a ship: same mission, entirely different engineering.

Keccak in the Wild

Ethereum addresses are Keccak-256 hashes (note: the pre-standardization variant, slightly different from NIST SHA3-256). Several post-quantum signature schemes build on SHA-3's extendable-output cousins, SHAKE128 and SHAKE256.

Security Note

No practical attacks exist against any SHA-3 variant. As with all fast hashes, it is for integrity and protocols — not for storing passwords (use Argon2 or bcrypt).

How to Use the SHA-3 256 Hash Generator

SHA-3-256 uses the Keccak sponge construction, the NIST standard published in 2015 — it was designed completely differently from SHA-2, so it is a genuine backup if SHA-2 ever weakens.

Type the message to hash with SHA3-256 — the sponge-construction successor to SHA-2.
Click the hash button to run the Keccak sponge algorithm over your input.
Copy the 64-character hexadecimal digest and compare it against published values to confirm integrity.

Example

Hashing the word hello with SHA-3-256 always produces 3338be694f50c5f338814986cdf0686453a888b84f424d792af4b9202398f392. Note this is completely different from the SHA-256 hash of the same word — the algorithms share nothing but the output size.

Frequently Asked Questions

How is SHA-3 different from SHA-2?
SHA-3 is built on the Keccak sponge construction rather than the Merkle–Damgård structure SHA-2 uses. It was chosen through an open NIST competition as insurance against any future SHA-2 attack.

When should I choose SHA-3-256 over SHA-256?
For brand-new systems and long-term security, SHA-3-256 is an excellent choice. For existing systems, SHA-256 remains perfectly fine — the two are both secure today.

Is the output the same length as SHA-256?
Yes — both produce 64 hexadecimal characters. But the digests of the same input never match, because the algorithms are entirely different inside.